<template>
  <div>
     <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddRoleDialog">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表区域 -->
      <el-table :data="rolesList" stripe border>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope= "scope">
            <el-row
              v-for="(item1, index1) in scope.row.children"
              :key="item1.id"
              :class="['bdbottom', index1 === 0 ? 'bdtop' : '', 'vcenter']"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="3">
                <el-tag
                  closable
                  @close="removeRightById(scope.row, item1.id)"
                >
                  {{item1.authName}}
                </el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="21">
                <!-- 通过for循环嵌套渲染二级权限 -->
                <el-row
                  v-for="(item2, index2) in item1.children"
                  :key="item2.id"
                  :class="[index2 === 0 ? '' : 'bdtop', 'vcenter']"
                >
                  <el-col :span="4">
                    <el-tag
                      type="success"
                      closable
                      @close="removeRightById(scope.row, item1.id)"
                    >
                      {{item2.authName}}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="20">
                    <el-tag
                      v-for="(item3) in item2.children"
                      :key="item3.id"
                      type="warning"
                      closable
                      @close="removeRightById(scope.row, item3.id)"
                    >
                      {{item3.authName}}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- <pre>{{scope.row}}</pre> -->
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditRoleDialog(scope.row)">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini" @click="deleteRole(scope.row.id)">删除</el-button>
            <el-button type="warning" icon="el-icon-setting" size="mini" @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      center
      @close="setRightDialogClosed"
    >
      <!-- 树形控件 -->
      <el-tree
        :data="rightsList"
        :props="treeProps"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defKeys"
        ref="treeRef"
      ></el-tree>

      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 添加角色对话框 -->
    <el-dialog
      title="添加角色"
      :visible.sync="addRoleDialogVisible"
      width="50%"
      center
      @close="addRoleDialogClosed"
    >
      <el-form
        :model="addRoleForm"
        ref="addRoleRef"
        :rules="addRoleRules"
        label-width="70px"
      >
        <el-form-item prop="roleName">
          <el-input v-model="addRoleForm.roleName" placeholder="请输入角色名称"></el-input>
        </el-form-item>
        <el-form-item prop="roleDesc">
          <el-input v-model="addRoleForm.roleDesc" placeholder="请输入角色描述"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addRoleDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addRole">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 编辑角色对话框 -->
    <el-dialog
      title="编辑角色"
      :visible.sync="editRoleDialogVisible"
      width="50%"
      center
      @close="editRoleDialogClosed"
    >
      <el-form :model="editRoleForm" :rules="editRoleRules" label-width="70px" ref="editRoleRef">
        <el-form-item prop="roleName">
          <el-input v-model="editRoleForm.roleName" placeholder="请输入角色名称"></el-input>
        </el-form-item>
        <el-form-item prop="roleDesc">
          <el-input v-model="editRoleForm.roleDesc" placeholder="请输入角色描述"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editRoleDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editRole">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 删除角色对话框 -->
    <!-- <el-dialog
      title="添加角色"
      :visible.sync="deleteRoleDialogVisible"
      width="50%"
      center
    >
      <span slot="footer" class="dialog-footer">
        <el-button @click="deleteRoleDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="deleteRole">确 定</el-button>
      </span>
    </el-dialog> -->
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 所有角色列表数据
      rolesList: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 所有权限的数据
      rightsList: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点id值数组
      defKeys: [],
      // 当前即将分配角色的Id
      roleId: '',
      // 控制添加角色、编辑角色、分配角色对话框的显示与隐藏
      addRoleDialogVisible: false,
      editRoleDialogVisible: false,
      deleteRoleDialogVisible: false,
      // 添加角色的表单
      addRoleForm: {
        roleName: '',
        roleDesc: ''
      },
      // 编辑角色表单
      editRoleForm: {
        roleName: '',
        roleDesc: ''
      },
      // 当前编辑的角色Id
      currentEditRoleId: '',
      // 添加角色的验证
      addRoleRules: {
        roleName: [
          { required: true, message: '请输入角色名', trigger: 'blur' }
        ]
      },
      // 编辑角色的验证
      editRoleRules: {
        roleName: [
          { required: true, message: '请输入角色名', trigger: 'blur' }
        ]
      }
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    // 获取所有角色的列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.rolesList = res.data
      // console.log(this.rolesList)
    },
    // 更具Id删除对应的权限
    async removeRightById(role, rightId) {
      // 弹框提示用户是否要删除
      const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }

      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.$message.success('删除权限成功')
      // 不建议直接重新获取 这样会重新解析表格的模板 会折叠起来
      // this.getRolesList()
      // res.data 是返回的最新的权限数据
      role.children = res.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog(role) {
      // 将即将分配权限的角色Id保存到data中
      this.roleId = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败')
      }
      // 把获取到的权限数据保存到data中
      this.rightsList = res.data
      // console.log(this.rightsList)

      // 递归获取三级节点的Id
      this.getLeafKeys(role, this.defKeys)

      this.setRightDialogVisible = true
    },
    // 通过递归的形式，获取角色下所有三级权限的Id 并保存到defKeys数组中
    getLeafKeys(node, arr) {
      // 如果当前node节点不包含children属性 则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }

      node.children.forEach(item => {
        this.getLeafKeys(item, arr)
      })
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed() {
      // 将保存默认选中的节点id值数组清空  不然会存留前面的数据
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      // console.log(keys)

      // 将保存的Id数组转换成以','分隔开的字符串
      const idStr = keys.join(',')

      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配角色权限失败')
      }
      this.$message.success('分配角色权限成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    },
    // 添加、编辑、删除角色
    addRole() {
      this.$refs.addRoleRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('roles', this.addRoleForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加角色失败！')
        }

        // 说明添加成功 返回的data中包含添加的角色信息 直接将这个追加到原来的角色列表中就行
        this.rolesList.push(res.data)
        this.$message.success('添加角色成功！')
        this.addRoleDialogVisible = false
      })
    },
    // 添加角色按钮事件
    showAddRoleDialog() {
      this.addRoleDialogVisible = true
    },
    // 添加角色弹框关闭时的处理事件
    addRoleDialogClosed() {
      // 将表单数据置为空
      this.$refs.addRoleRef.resetFields()
    },
    editRole() {
      this.$refs.editRoleRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put('roles/' + this.currentEditRoleId, this.editRoleForm)
        // console.log(res)
        if (res.meta.status !== 200) {
          return this.$message.error('编辑角色失败！')
        }

        this.$message.success('编辑角色成功！')
        // 重新获取数据
        this.getRolesList()
        this.editRoleDialogVisible = false
      })
    },
    // 编辑角色按钮事件
    showEditRoleDialog(role) {
      this.currentEditRoleId = role.id
      this.editRoleForm.roleName = role.roleName
      this.editRoleForm.roleDesc = role.roleDesc
      this.editRoleDialogVisible = true
    },
    // 编辑角色弹框关闭时的处理事件
    editRoleDialogClosed() {
      // 将表单数据置为空
      this.$refs.editRoleRef.resetFields()
    },
    // 删除角色
    async deleteRole(id) {
      // 弹框询问用户是否删除
      // 这里返回的promise 所以可以用async 和 await 优化
      const confirmResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 如果用户确认删除 则返回值是字符串 confirm
      // 如果用户取消删除 则返回值是字符串 cancel
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除！')
      }
      const { data: res } = await this.$http.delete('roles/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('删除角色失败！')
      }

      this.$message.success('删除角色成功！')
      // 重新获取数据
      this.getRolesList()
    }
  }
}
</script>

<style lang="less" scoped>
  .el-tag {
    margin: 7px;
  }

  .bdtop {
    border-top: 1px solid #eee;
  }

  .bdbottom {
    border-top: 1px solid #eee;
  }

  .vcenter {
    display: flex;
    align-items: center;
  }
</style>
